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feat!: migrate floor task-stack report onto bb_data_render_rows (B1-1418 PR-2) (#1222)

- floor_app.c binds a rows-only "tasks" bb_data key (desc/gather/apply
  all NULL, rows non-NULL, the shape PR-1/#1221 legalized) onto
  bb_serialize_console_tasks_row_desc/bb_serialize_console_tasks_gather()
  via a private row_gather thunk, and drives it through
  bb_data_render_rows() on the existing periodic tick
- floor now also registers the BB_FORMAT_CONSOLE backend
  (bb_serialize_console_register_format()) -- nothing in floor registered
  it before this PR; bb_data_render_rows() requires a registered
  renderer to work, unlike the direct bb_serialize_console_render() calls
  this migration replaces
- BREAKING: retires bb_serialize_console_tasks_report(), removed from
  bb_serialize_console's public header and .c file along with its
  now-dead s_task_rows static and the Kconfig line-max bridge that only
  it used; the row descriptor/gather primitives it was built on stay
  public
- adds host coverage for the row-gather thunk's shape and a rows-only
  tasks-style binding rendered end to end through bb_data_render_rows()
  with content asserted, replacing the retired entry point's smoke test
- firmware review fix: BB_TASK_BASE_MAX (components/bb_task/Kconfig) is
  a live range-1-64 Kconfig that can outgrow floor's fixed row-scratch
  capacity, silently dropping tasks from the report with no signal;
  floor_task_stack.c/.h add a pure, host-tested, latched
  "possibly truncated" warning (new file, mirrors floor_prov_reboot.c's
  pure-guard/direct-#include host-test pattern) rather than reintroducing
  the bb_task dependency this migration deliberately decoupled. The
  guard's predicate is emitted == max_rows, narrowed to exactly what its
  one real call site (an already-clamped gather return) can produce --
  no dead defensive arm kept alive just to satisfy the branch-coverage
  gate
- firmware review fix: reworded bb_serialize_console_tasks_row_desc's
  stale ... (continued)

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